WO2010003402A1 - Process for cooling a strand emanating from a continuous-casting mould - Google Patents

Process for cooling a strand emanating from a continuous-casting mould Download PDF

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Publication number
WO2010003402A1
WO2010003402A1 PCT/DE2009/000952 DE2009000952W WO2010003402A1 WO 2010003402 A1 WO2010003402 A1 WO 2010003402A1 DE 2009000952 W DE2009000952 W DE 2009000952W WO 2010003402 A1 WO2010003402 A1 WO 2010003402A1
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WO
WIPO (PCT)
Prior art keywords
cooling
strand
cooling zone
intensive
intensive cooling
Prior art date
Application number
PCT/DE2009/000952
Other languages
German (de)
French (fr)
Inventor
Uwe Plociennik
Tilmann Bocher
Uwe Grafe
Original Assignee
Sms Siemag Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sms Siemag Ag filed Critical Sms Siemag Ag
Priority to CN2009801264983A priority Critical patent/CN102089098A/en
Priority to EP09775940A priority patent/EP2307159A1/en
Publication of WO2010003402A1 publication Critical patent/WO2010003402A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
    • B22D11/1246—Nozzles; Spray heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
    • B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling

Definitions

  • the invention relates to a method for cooling a strand emerging from a continuous casting mold, wherein a secondary cooling zone adjoins the continuous casting mold.
  • the object of the invention is to further improve the internal quality of continuously cast steels, in particular thin slabs.
  • this is done in that in the secondary cooling zone, starting immediately below the mold, a two-stage intensive cooling takes place at most until the solidification of the strand, which takes place in the last part of the intensive cooling zone with a finer cooling zone distribution.
  • the intensive cooling should start immediately under the mold.
  • the intensive cooling is to be carried out at maximum until the solidification of the strand, the intensive cooling is better to reduce the overheating (liquidus temperature minus the supercooling) to perform the melt.
  • the cooling intensity must be selected so that, in the case of structural transformation taking place on the strand surface, structural transformation across the width of the strand takes place uniformly in order to minimize stresses in the strand shell. Whether it comes to a structural transformation depends on the material composition
  • the last part of the intensive cooling zone must be provided with a finer cooling zone distribution in order to avoid undesirable low surface temperatures.
  • Each cooling zone in the finer cooling zone distribution is provided with a control for the amount of cooling water and consists of a maximum of 2-3 spray zones (in the transport direction).
  • the specific water application of the intensive cooling should be greater than or equal to 750 l / min m 2 .
  • the cooling intensity must be set so high that the Leidenfrost temperature falls below and thus more intensive cooling of the strand sets in to influence the segregation.
  • the reduction in macrosegregation has advantages for all steel grades, which have higher contents of alloying elements and undesirable accompanying elements, such as e.g. As carbon, manganese, sulfur, phosphorus, etc.
  • the inventive method is applicable both to the casting of thin slabs as well as normal slab dimensions.
  • Fig. 2 shows the different cooling zones in a vertical caster
  • the temperature of the slab center is plotted over time, so that its cooling during intensive cooling can be seen from this. Also marked are the liquidus and the solidus temperatures, as well as the subcooling area.
  • the intensive cooling should be carried out at maximum until solidification of the strand (solidus temperature), better the intensive cooling until the reduction of overheating (liquidus temperature minus the supercooling) of the melt to perform.
  • Figures 2 and 3 show the division of the intensive cooling in the upper area, which begins directly under the mold and in the area, which takes place with finer zoning.
  • the influence of intensive cooling on the slab core is shown by the example of the manganese concentration, on the one hand with a cooling with 600 l / min m 2 and on the other hand with 750 l / min m 2 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

The invention relates to a process for cooling a strand emanating from a continuous-casting mould, wherein the continuous-casting mould is adjoined by a secondary cooling zone. It is provided in the present invention that two-stage intensive cooling is carried out in the secondary cooling zone, starting directly underneath the mould, at most until the strand has fully solidified, wherein said intensive cooling is carried out in the last part of the intensive cooling zone with finer cooling zone division.

Description

Verfahren zum Abkühlen eines aus einer Stranggießkokille austretenden Stranges A method of cooling a strand emerging from a continuous casting mold
Die Erfindung betrifft ein Verfahren zum Abkühlen eines aus einer Stranggießkokille austretenden Stranges, wobei sich an die Stranggießkokille eine Sekundärkühlzone anschließt.The invention relates to a method for cooling a strand emerging from a continuous casting mold, wherein a secondary cooling zone adjoins the continuous casting mold.
Die vorstehende Anordnungsfolge ist bei Stranggießanlagen allgemein bekannt, wobei als Beispiel hierzu die EP 650 790 B1 genannt werden kann.The above arrangement sequence is generally known in continuous casting plants, with EP 650 790 B1 being mentioned as an example for this purpose.
Aus der JP 2001062550 A ist es auch bekannt, in der sich an die Kokille anschließenden Sekundärkühlzone, eine stärkere Abkühlung vorzunehmen mit einer Wasservolumendichte von 100-300 (l/min. m2). Diese verstärkte Kühlung soll dazu führen, dass die äußere Schale des Stranges schneller wächst, um damit einer Porosität oder Seigerung im Kernbereich des Stranges entgegenzuwirken. Diese starke Kühlung ist aber auf den oberen Bereich der Strangführung beschränkt.From JP 2001062550 A it is also known, in which adjoining the mold secondary cooling zone to make a stronger cooling with a water volume density of 100-300 (l / min. M2). This increased cooling should cause the outer shell of the strand to grow faster, thereby counteracting porosity or segregation in the core area of the strand. This strong cooling is limited to the upper part of the strand guide.
Aufgabe der Erfindung ist es, die Innenqualität von stranggegossenen Stählen, insbesondere Dünnbrammen, weiter zu verbessern.The object of the invention is to further improve the internal quality of continuously cast steels, in particular thin slabs.
Erfindungsgemäß geschieht dies dadurch, dass in der Sekundärkühlzone, unmittelbar unter der Kokille beginnend, eine zweistufige Intensivkühlung erfolgt, die maximal bis zur Durcherstarrung des Stranges erfolgen, wobei im letzten Teil der Intensivkühlzone diese mit einer feineren Kühlzonenaufteilung erfolgt.According to the invention, this is done in that in the secondary cooling zone, starting immediately below the mold, a two-stage intensive cooling takes place at most until the solidification of the strand, which takes place in the last part of the intensive cooling zone with a finer cooling zone distribution.
Durch diese Intensivkühlung wird die Innenqualität der Dünnbramme erheblich verbessert. Bei dieser Kühlung ist folgendes zu beachten:This intensive cooling considerably improves the internal quality of the thin slab. With this cooling the following is to be considered:
Die Intensivkühlung soll unmittelbar unter der Kokille beginnen.The intensive cooling should start immediately under the mold.
Die Intensivkühlung soll maximal bis zur Durcherstarrung des Stranges erfolgen, besser ist die Intensivkühiung bis zum Abbau der Überhitzung ( Liquidustemperatur minus der Unterkühlung) der Schmelze durchzuführen.The intensive cooling is to be carried out at maximum until the solidification of the strand, the intensive cooling is better to reduce the overheating (liquidus temperature minus the supercooling) to perform the melt.
Die Kühlintensität muss so gewählt werden, dass in Falle einer an der Strangoberfläche erfolgenden Gefügeumwandlung, die Gefügeumwandlung über die Breite des Stranges gleichmäßig erfolgt um Spannungen in der Strangschale zu minimieren. Ob es zu einer Gefügeumwandlung kommt ist abhängig von der WerkstoffzusammensetzungThe cooling intensity must be selected so that, in the case of structural transformation taking place on the strand surface, structural transformation across the width of the strand takes place uniformly in order to minimize stresses in the strand shell. Whether it comes to a structural transformation depends on the material composition
Der letzte Teil der Intensivkühlzone muss mit einer feineren Kühlzonenaufteilung versehen werden, um ungewünscht niedrige Oberflächentemperaturen zu vermeiden.The last part of the intensive cooling zone must be provided with a finer cooling zone distribution in order to avoid undesirable low surface temperatures.
Jede Kühlzone in der feineren Kühlzonenaufteilung ist mit einer Regelung für die Kühlwassermenge versehen und besteht aus maximal 2-3 Spritzzonen (in Transportrichtung).Each cooling zone in the finer cooling zone distribution is provided with a control for the amount of cooling water and consists of a maximum of 2-3 spray zones (in the transport direction).
Die spezifische Wasserbeaufschlagung der Intensivkühlung sollte größer/gleich 750 l/min m 2 betragen.The specific water application of the intensive cooling should be greater than or equal to 750 l / min m 2 .
Die Kühlintensität ist so hoch einzustellen, dass die Leidenfrosttemperatur unterschritten und somit eine intensivere Kühlung des Stranges zur Beeinflussung der Seigerungen einsetzt.The cooling intensity must be set so high that the Leidenfrost temperature falls below and thus more intensive cooling of the strand sets in to influence the segregation.
Die Reduzierung der Makroseigerung hat bei allen Stahlsorten Vorteile, die höhere Gehalte an Legierungselementen und unerwünschten Begleitelementen aufweisen, wie z. B. Kohlenstoff, Mangan, Schwefel, Phosphor usw.The reduction in macrosegregation has advantages for all steel grades, which have higher contents of alloying elements and undesirable accompanying elements, such as e.g. As carbon, manganese, sulfur, phosphorus, etc.
Das erfindungsgemäße Verfahren ist sowohl auf das Gießen von Dünnbrammen wie auch normale Brammen Abmessungen anzuwenden.The inventive method is applicable both to the casting of thin slabs as well as normal slab dimensions.
Die Erfindung soll nachfolgend mit Bezug auf die Zeichnungen näher erläutert werden. Dabei zeigt:The invention will be explained in more detail with reference to the drawings. Showing:
Fig. 1 schematisch den Temperaturverlauf der Brammenmitte bei der Intensivkühlung,1 shows schematically the temperature profile of the slab center in the intensive cooling,
Fig. 2 die unterschiedlichen Kühlzonen bei einer Senkrechtgießanlage undFig. 2 shows the different cooling zones in a vertical caster and
Fig. 3 die unterschiedlichen Kühlzonen bei einer Bogengießanlage,3 shows the different cooling zones in a Bogengießanlage,
Fig. 4 und 5 die Mangankonzentration bezogen auf die Zeilenmitte bei 600 bzw. 750 l/min, m2 4 and 5, the manganese concentration based on the center of the line at 600 and 750 l / min, m 2
In der Figur 1 ist die Temperatur der Brammenmitte über der Zeit aufgetragen, so dass hieraus deren Abkühlung bei der Intensivkühlung zu ersehen ist. Eingezeichnet sind außerdem die Liquidus und die Solidus Temperaturen, sowie der Unterkühlungsbereich.In FIG. 1, the temperature of the slab center is plotted over time, so that its cooling during intensive cooling can be seen from this. Also marked are the liquidus and the solidus temperatures, as well as the subcooling area.
Wie vorher angegeben, soll die Intensivkühlung maximal bis zur Durcherstarrung des Stranges ( Solidus Temperatur) erfolgen, besser ist die Intensivkühlung bis zum Abbau der Überhitzung ( Liquidustemperatur minus der Unterkühlung) der Schmelze durchzuführen.As previously stated, the intensive cooling should be carried out at maximum until solidification of the strand (solidus temperature), better the intensive cooling until the reduction of overheating (liquidus temperature minus the supercooling) of the melt to perform.
Die Figuren 2 und 3 zeigen die Aufteilung der Intensivkühlung in den oberen Bereich, der direkt unter der Kokille beginnt und in den Bereich, der mit feinerer Zonenaufteilung erfolgt.Figures 2 and 3 show the division of the intensive cooling in the upper area, which begins directly under the mold and in the area, which takes place with finer zoning.
Welchen Einfluss die Intensivkühlung auf den Brammenkern hat, zeigt sich am Beispiel der Mangankonzentration, einerseits bei einer Abkühlung mit 600 l/min m2 und andererseits bei 750 l/min m2.The influence of intensive cooling on the slab core is shown by the example of the manganese concentration, on the one hand with a cooling with 600 l / min m 2 and on the other hand with 750 l / min m 2 .
Je größer die aufgebrachte Wassermenge ist, desto verteilter ist die Mangankonzentration, ohne das besondere Spitzen, also hohe Konzentrationen in der Mitte auftreten. The larger the amount of water applied, the more distributed the manganese concentration, without the special peaks, so high concentrations occur in the middle.

Claims

Patentansprüche claims
1. Verfahren zum Abkühlen eines aus einer Stranggießkokille austretenden Stranges, wobei sich an die Stranggießkokille eine Sekundärkühlzone anschließt, dadurch gekennzeichnet, dass in der Sekundärkühlzone, unmittelbar unter der Kokille beginnend, eine zweistufige Intensivkühlung erfolgt, die maximal bis zur Durcherstarrung des Stranges erfolgen, wobei im letzten Teil der Intensivkühlzone diese mit einer feineren Kühlzonenaufteilung erfolgt.1. A method for cooling a emerging from a continuous casting strand, wherein the continuous casting mold is followed by a secondary cooling zone, characterized in that in the secondary cooling zone, starting immediately below the mold, a two-stage intensive cooling takes place, the maximum take place until solidification of the strand, said in the last part of the intensive cooling zone this takes place with a finer cooling zone distribution.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass die Intensivkühlung bis zum Abbau der Überhitzung, Liquidustemperatur minus der Unterkühlung, der Schmelze durchgeführt wird.2. The method according to claim 1, characterized in that the intensive cooling is carried out until the degradation of superheating, liquidus temperature minus the supercooling, the melt.
3. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Kühlintensität so gewählt wird, dass in Falle einer an der Strangoberfläche erfolgenden Gefügeumwandlung, die Gefügeumwandlung über die Breite des Stranges gleichmäßig erfolgt.3. The method according to any one of the preceding claims, characterized in that the cooling intensity is chosen so that in the case of taking place on the strand surface microstructure transformation, the structural transformation over the width of the strand is uniform.
4. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass jede Kühlzone mit einer Regelung für die Kühlwassermenge versehen ist, die aus maximal 2-3 Spritzzonen besteht.4. The method according to any one of the preceding claims, characterized in that each cooling zone is provided with a control for the amount of cooling water, which consists of a maximum of 2-3 spray zones.
5. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die spezifische Wasserbeaufschlagung der Intensivkühlung größer/gleich 750 l/min m2 beträgt.5. The method according to any one of the preceding claims, characterized in that the specific water admission of the intensive cooling is greater than or equal to 750 l / min m 2 .
6. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Kühlintensität so hoch eingestellt wird.dass die Leidenfrosttemperatur unterschritten wird. 6. The method according to any one of the preceding claims, characterized in that the cooling intensity is adjusted so high that the Leidenfrost temperature is exceeded.
PCT/DE2009/000952 2008-07-10 2009-07-03 Process for cooling a strand emanating from a continuous-casting mould WO2010003402A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN2009801264983A CN102089098A (en) 2008-07-10 2009-07-03 Process for cooling a strand emanating from a continuous-casting mould
EP09775940A EP2307159A1 (en) 2008-07-10 2009-07-03 Process for cooling a strand emanating from a continuous-casting mould

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200810032970 DE102008032970A1 (en) 2008-07-10 2008-07-10 A method of cooling a strand emerging from a continuous casting mold
DE102008032970.3 2008-07-10

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014214374A1 (en) 2014-07-23 2016-01-28 Sms Group Gmbh Process for producing a metallic product

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017213842A1 (en) * 2017-08-08 2019-02-14 Sms Group Gmbh Method and plant for continuous casting of a metallic product

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0650790B1 (en) * 1993-10-29 2002-08-14 DANIELI & C. OFFICINE MECCANICHE S.p.A. Method for thermal surface treatment in a continuous casting machine and relative device
JP2002307148A (en) * 2001-04-09 2002-10-22 Sumitomo Metal Ind Ltd Apparatus for continuously casting steel and continuous casting method
DE102006056683A1 (en) * 2006-01-11 2007-07-12 Sms Demag Ag Continuous casting of metal profiles, first cools cast strip then permits thermal redistribution to re-heat surface before mechanical deformation

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Publication number Priority date Publication date Assignee Title
JP3401785B2 (en) 1999-08-27 2003-04-28 住友金属工業株式会社 Cooling method of slab in continuous casting

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0650790B1 (en) * 1993-10-29 2002-08-14 DANIELI & C. OFFICINE MECCANICHE S.p.A. Method for thermal surface treatment in a continuous casting machine and relative device
JP2002307148A (en) * 2001-04-09 2002-10-22 Sumitomo Metal Ind Ltd Apparatus for continuously casting steel and continuous casting method
DE102006056683A1 (en) * 2006-01-11 2007-07-12 Sms Demag Ag Continuous casting of metal profiles, first cools cast strip then permits thermal redistribution to re-heat surface before mechanical deformation

Non-Patent Citations (2)

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Title
M. RAUDENSKY, J. HORSKY: "Secondary cooling in continuous casting and Leidenfrost temperature effects", IRONMAKING AND STEELMAKING, vol. 32, no. 2, 2005, pages 159 - 164, XP002547988 *
SENGUPTA J ET AL: "Understanding the role water-cooling plays during continuous casting of steel and aluminum alloys", MATERIALS SCIENCE AND TECHNOLOGY - MATERIALS SCIENCE AND TECHNOLOGY, MS AND T 2004; VOLUME 2: AIST/TMS PROCEEDINGS 2004 ASSOCIATION FOR IRON AND STEEL TECHNOLOGY, AISTECH US, vol. 2, 2004, Warrendale, US, pages 179 - 193, XP002547987 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014214374A1 (en) 2014-07-23 2016-01-28 Sms Group Gmbh Process for producing a metallic product
US10894994B2 (en) 2014-07-23 2021-01-19 Sms Group Gmbh Method for producing a metal product

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DE102008032970A1 (en) 2010-01-14
CN102089098A (en) 2011-06-08
EP2307159A1 (en) 2011-04-13

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